Bluetooth LE Printers

Some wireless receipt printers come with Bluetooth Low Energy support, and you can use these with Espruino Bluetooth LE devices using the ble_printer (About Modules) module as follows:

var printer = require("ble_printer");

// Some graphics to print
var g = Graphics.createArrayBuffer(256,32,1,{msb:true});
g.setFontVector(32);
g.drawString("Espruino!");

// Connect to nearest Printer
NRF.requestDevice({ filters: [{ services: ['18f0'] }] }).then(function(device) {
  // When connected print 'Hello World' text, and then the graphics
  printer.print(device, "Hello World\n" + printer.getGraphics(g), function() {
    print('Done!');
  });
});